the new york times reporting tamerlan's application for u.s. citizenship was under review because background check showed he was interviewed by the fbi in 2011 to possible ties to chechen terrorists. he was cleared and his uncle said tamerlan had been radicalized in recent years. >> no purpose in life but to pursue path of god. >> reporter: this memorial near the finish line of the marathon keeps growing. people are leaving flowers, balloons and cards to remember the three victims killed here almost a week ago. this morning in london, tens of thousands of runners in the london marathon held a moment of silence and wore black ribbons in honor of the victims. officials increased the number of police on site by 40%. susan mcginnis, cbs news boston. >>> and police now say that before a shoot out with the suspects on friday, the brothers used the atm card of a man they had carjacked. it also had a pressure cooker like those used in the bombings that they threw out of the car along with ammunition and two hand grenades. >>> meanwhile several vigils w